This summer’s visitors to our national parks—along with future visitors—may be welcomed by dirtier air, polluted water, and natural gas and oil drilling operations that are fast encroaching on natural wonders.

The Grand Canyon in Arizona, Bryce Canyon National Park in Utah, and the Bridger-Teton National Forest in Wyoming—three majestic places held in the public trust—are could be irrevocably changed by nearby mining and drilling.